Near-infrared and visible dual emissive transparent nanopaper based on Yb(III)–carbon quantum dots grafted oxidized nanofibrillated cellulose for anti-counterfeiting applications

Zhao Zhang*, Hui Chang, Bailiang Xue, Sufeng Zhang, Xinping Li, Rick W K WONG, Kecheng Li, Xunjin ZHU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Citations (Scopus)

Abstract

We report a novel near-infrared (NIR) and visible dual emissive transparent Yb3+-nanopaper, which is produced from Yb3+-CQDs grafted oxidized nanofibrillated cellulose (Yb3+-CQDs-ONFC) using a press-controlled extrusion film-making method. The Yb3+-nanopaper exhibits excellent properties, including high transparency (90%), good flexibility, visible fluorescence and NIR phosphorescence. The morphology and chemical structures of Yb3+-nanopaper are investigated with SEM, TEM, XRD, XPS, ICP-OES and FT-IR spectroscopy. The experimental results show that the Yb3+-CQDs have been successfully grafted onto ONFC matrix, and the Yb3+-CQDs are well dispersed in nanopaper with strong visible-NIR dual emission under only one UV excitation. In the Yb3+-nanopaper, CQDs not only act as visible fluorescence “emitter” but also as “antenna” sensitizing Yb3+ ions with NIR characteristic luminescence. And the sensitization of the energy transfer pathway is mainly through singlet state (1LC). Furthermore, the surface passivation of Yb3+-CQDs with ONFC produces an enhanced NIR luminescence by eight times in intensity. Of importance here is that high level security codes of Yb3+-nanopaper can be achieved in three fashions including colour tuning from blue to yellow, NIR/visible spectra, and nanosecond/microsecond lifetime. In addition, aqueous solution of Yb3+-CQDs-ONFC being colourless and transparent can be applied as water-based security ink and spread on the currency note or filter paper, and the spread patterns on the filter paper are stable under water or moist environment.

Original languageEnglish
Pages (from-to)377-389
Number of pages13
JournalCellulose
Volume25
Issue number1
DOIs
Publication statusPublished - 1 Jan 2018

Scopus Subject Areas

  • Polymers and Plastics

User-Defined Keywords

  • NIR-visible dual emission
  • Oxidized nanofibrillated cellulose
  • Transparent nanopaper
  • Water-based ink
  • Yb(III) doped carbon quantum dots

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